java发送UDP消息

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package common;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class UDPMsgExample {
 public static void main(String[] args) throws Exception{
     if( args.length > 0 ){
       System.out.println("to send");
       send();
     }else{
       System.out.println("to recv");
       recv();
     }
   }
  
   public static void send() throws Exception{
     DatagramSocket s = new DatagramSocket(null);
     s.setReuseAddress(true);
     s.bind(new InetSocketAddress(8888));
     byte[] b = new byte[100];
     for(int i=0; i <b.length; i++){
       b[i] = (byte)i;
     }
     DatagramPacket p = new DatagramPacket(b, 0, b.length, new InetSocketAddress("localhost", 9999));
     s.send(p);
   }
  
   public static void recv() throws Exception{
     DatagramSocket s = new DatagramSocket(null);
     s.setReuseAddress(true);
     s.bind(new InetSocketAddress(9999));
     byte[] b = new byte[100];
     DatagramPacket p = new DatagramPacket(b, 0, b.length);
     s.receive(p);
     String strvalue = p.getData().toString();
     System.out.println(p.getAddress() + ":" + p.getPort() + " " + p.getLength() + " " + strvalue);
   }

}